1 /* This file is part of Pazpar2.
2 Copyright (C) 2006-2010 Index Data
4 Pazpar2 is free software; you can redistribute it and/or modify it under
5 the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2, or (at your option) any later
9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 // This module implements a generic system of settings
21 // (attribute-value) that can be associated with search targets. The
22 // system supports both default values, per-target overrides, and
33 #include <sys/types.h>
34 #include <yaz/dirent.h>
38 #include <libxml/parser.h>
39 #include <libxml/tree.h>
48 // Used for initializing setting_dictionary with pazpar2-specific settings
49 static char *hard_settings[] = {
71 "pz:negotiation_charset",
73 "pz:reuse_connections", // PZ_REUSE_CONNECTION
74 "pz:termlist_term_sort", // PZ_TERMLIST_TERM_SORT
75 "pz:termlist_term_count", // PZ_TERMLIST_TERM_COUNT
79 struct setting_dictionary
86 // This establishes the precedence of wildcard expressions
87 #define SETTING_WILDCARD_NO 0 // No wildcard
88 #define SETTING_WILDCARD_DB 1 // Database wildcard 'host:port/*'
89 #define SETTING_WILDCARD_YES 2 // Complete wildcard '*'
91 // Returns size of settings directory
92 int settings_num(struct conf_service *service)
94 return service->dictionary->num;
97 static int settings_lookup(struct conf_service *service, const char *name,
103 struct setting_dictionary *dictionary = service->dictionary;
107 if (!strncmp("pz:", name, 3) && (p = strchr(name + 3, ':')))
108 maxlen = (p - name) + 1;
110 maxlen = strlen(name) + 1;
111 for (i = 0; i < dictionary->num; i++)
112 if (!strncmp(name, dictionary->dict[i], maxlen))
116 if (!strncmp("pz:", name, 3))
117 yaz_log(YLOG_WARN, "Adding pz-type setting name %s", name);
118 if (dictionary->num + 1 > dictionary->size)
121 nmem_malloc(service->nmem, dictionary->size * 2 * sizeof(char*));
122 memcpy(tmp, dictionary->dict, dictionary->size * sizeof(char*));
123 dictionary->dict = tmp;
124 dictionary->size *= 2;
126 dictionary->dict[dictionary->num] = nmem_strdup(service->nmem, name);
127 dictionary->dict[dictionary->num][maxlen-1] = '\0';
128 return dictionary->num++;
131 int settings_create_offset(struct conf_service *service, const char *name)
133 return settings_lookup(service, name, 1);
136 int settings_lookup_offset(struct conf_service *service, const char *name)
138 return settings_lookup(service, name, 0);
141 char *settings_name(struct conf_service *service, int offset)
143 assert(offset < service->dictionary->num);
144 return service->dictionary->dict[offset];
147 static int isdir(const char *path)
151 if (stat(path, &st) < 0)
153 yaz_log(YLOG_FATAL|YLOG_ERRNO, "stat %s", path);
156 return st.st_mode & S_IFDIR;
159 // Read settings from an XML file, calling handler function for each setting
160 void settings_read_node_x(xmlNode *n,
162 void (*fun)(void *client_data,
163 struct setting *set))
165 xmlChar *namea, *targeta, *valuea, *usera, *precedencea;
167 namea = xmlGetProp(n, (xmlChar *) "name");
168 targeta = xmlGetProp(n, (xmlChar *) "target");
169 valuea = xmlGetProp(n, (xmlChar *) "value");
170 usera = xmlGetProp(n, (xmlChar *) "user");
171 precedencea = xmlGetProp(n, (xmlChar *) "precedence");
172 for (n = n->children; n; n = n->next)
174 if (n->type != XML_ELEMENT_NODE)
176 if (!strcmp((const char *) n->name, "set"))
178 char *name, *target, *value, *user, *precedence;
180 name = (char *) xmlGetProp(n, (xmlChar *) "name");
181 target = (char *) xmlGetProp(n, (xmlChar *) "target");
182 value = (char *) xmlGetProp(n, (xmlChar *) "value");
183 user = (char *) xmlGetProp(n, (xmlChar *) "user");
184 precedence = (char *) xmlGetProp(n, (xmlChar *) "precedence");
186 if ((!name && !namea) || (!value && !valuea) || (!target && !targeta))
188 yaz_log(YLOG_FATAL, "set must specify name, value, and target");
198 // Copy everything into a temporary buffer -- we decide
199 // later if we are keeping it.
201 set.precedence = atoi((char *) precedence);
202 else if (precedencea)
203 set.precedence = atoi((char *) precedencea);
207 strcpy(targetb, target);
209 strcpy(targetb, (const char *) targeta);
210 set.target = targetb;
214 strcpy(nameb, (const char *) namea);
217 strcpy(valueb, value);
219 strcpy(valueb, (const char *) valuea);
222 (*fun)(client_data, &set);
232 yaz_log(YLOG_FATAL, "Unknown element %s in settings file", (char*) n->name);
237 xmlFree(precedencea);
243 static void read_settings_file(const char *path,
245 void (*fun)(void *client_data,
246 struct setting *set))
248 xmlDoc *doc = xmlParseFile(path);
253 yaz_log(YLOG_FATAL, "Failed to parse %s", path);
256 n = xmlDocGetRootElement(doc);
257 settings_read_node_x(n, client_data, fun);
263 // Recursively read files or directories, invoking a
264 // callback for each one
265 static void read_settings(const char *path,
267 void (*fun)(void *client_data,
268 struct setting *set))
276 if (!(d = opendir(path)))
278 yaz_log(YLOG_FATAL|YLOG_ERRNO, "%s", path);
281 while ((de = readdir(d)))
284 if (*de->d_name == '.' || !strcmp(de->d_name, "CVS"))
286 sprintf(tmp, "%s/%s", path, de->d_name);
287 read_settings(tmp, client_data, fun);
291 else if ((dot = strrchr(path, '.')) && !strcmp(dot + 1, "xml"))
292 read_settings_file(path, client_data, fun);
295 // Determines if a ZURL is a wildcard, and what kind
296 static int zurl_wildcard(const char *zurl)
299 return SETTING_WILDCARD_NO;
301 return SETTING_WILDCARD_YES;
302 else if (*(zurl + strlen(zurl) - 1) == '*')
303 return SETTING_WILDCARD_DB;
305 return SETTING_WILDCARD_NO;
308 struct update_database_context {
310 struct conf_service *service;
313 void expand_settings_array(struct setting ***set_ar, int *num, int offset,
320 int i, n_num = offset + 10;
321 struct setting **n_ar = nmem_malloc(nmem, n_num * sizeof(*n_ar));
322 for (i = 0; i < *num; i++)
323 n_ar[i] = (*set_ar)[i];
324 for (; i < n_num; i++)
331 // This is called from grep_databases -- adds/overrides setting for a target
332 // This is also where the rules for precedence of settings are implemented
333 static void update_database(void *context, struct database *db)
335 struct setting *set = ((struct update_database_context *)
337 struct conf_service *service = ((struct update_database_context *)
342 // Is this the right database?
343 if (!match_zurl(db->url, set->target))
346 offset = settings_create_offset(service, set->name);
347 expand_settings_array(&db->settings, &db->num_settings, offset,
350 // First we determine if this setting is overriding any existing settings
351 // with the same name.
352 assert(offset < db->num_settings);
353 for (sp = &db->settings[offset]; *sp; )
354 if (!strcmp((*sp)->name, set->name))
356 if ((*sp)->precedence < set->precedence)
358 // We discard the value (nmem keeps track of the space)
359 *sp = (*sp)->next; // unlink value from existing setting
361 else if ((*sp)->precedence > set->precedence)
363 // Db contains a higher-priority setting. Abort search
366 else if (zurl_wildcard((*sp)->target) > zurl_wildcard(set->target))
368 // target-specific value trumps wildcard. Delete.
369 *sp = (*sp)->next; // unlink.....
371 else if (zurl_wildcard((*sp)->target) < zurl_wildcard(set->target))
372 // Db already contains higher-priority setting. Abort search
379 if (!*sp) // is null when there are no higher-priority settings, so we add one
381 struct setting *new = nmem_malloc(service->nmem, sizeof(*new));
383 memset(new, 0, sizeof(*new));
384 new->precedence = set->precedence;
385 new->target = nmem_strdup(service->nmem, set->target);
386 new->name = nmem_strdup(service->nmem, set->name);
387 new->value = nmem_strdup(service->nmem, set->value);
388 new->next = db->settings[offset];
389 db->settings[offset] = new;
393 // Callback -- updates database records with dictionary entries as appropriate
394 // This is used in pass 2 to assign name/value pairs to databases
395 static void update_databases(void *client_data, struct setting *set)
397 struct conf_service *service = (struct conf_service *) client_data;
398 struct update_database_context context;
400 context.service = service;
401 predef_grep_databases(&context, service, update_database);
404 // This simply copies the 'hard' (application-specific) settings
405 // to the settings dictionary.
406 static void initialize_hard_settings(struct conf_service *service)
408 struct setting_dictionary *dict = service->dictionary;
409 dict->dict = nmem_malloc(service->nmem, sizeof(hard_settings) - sizeof(char*));
410 dict->size = (sizeof(hard_settings) - sizeof(char*)) / sizeof(char*);
411 memcpy(dict->dict, hard_settings, dict->size * sizeof(char*));
412 dict->num = dict->size;
415 // Read any settings names introduced in service definition (config) and add to dictionary
416 // This is done now to avoid errors if user settings are declared in session overrides
417 static void initialize_soft_settings(struct conf_service *service)
421 for (i = 0; i < service->num_metadata; i++)
423 struct conf_metadata *md = &service->metadata[i];
425 if (md->setting == Metadata_setting_no)
428 settings_create_offset(service, md->name);
432 static void prepare_target_dictionary(void *client_data, struct setting *set)
434 struct conf_service *service = (struct conf_service *) client_data;
435 struct setting_dictionary *dictionary = service->dictionary;
440 // If target address is not wildcard, add the database
441 if (*set->target && !zurl_wildcard(set->target))
442 find_database(set->target, service);
444 // Determine if we already have a dictionary entry
445 if (!strncmp(set->name, "pz:", 3) && (p = strchr(set->name + 3, ':')))
447 for (i = 0; i < dictionary->num; i++)
448 if (!strcmp(dictionary->dict[i], set->name))
450 yaz_log(YLOG_WARN, "Setting '%s' not configured as metadata", set->name);
453 void init_settings(struct conf_service *service)
455 struct setting_dictionary *new;
457 assert(service->nmem);
459 new = nmem_malloc(service->nmem, sizeof(*new));
460 memset(new, 0, sizeof(*new));
461 service->dictionary = new;
462 initialize_hard_settings(service);
463 initialize_soft_settings(service);
466 void settings_read_file(struct conf_service *service, const char *path,
470 read_settings(path, service, prepare_target_dictionary);
472 read_settings(path, service, update_databases);
475 void settings_read_node(struct conf_service *service, xmlNode *n,
479 settings_read_node_x(n, service, prepare_target_dictionary);
481 settings_read_node_x(n, service, update_databases);
487 * c-file-style: "Stroustrup"
488 * indent-tabs-mode: nil
490 * vim: shiftwidth=4 tabstop=8 expandtab